Danil,
As far as I know, the grpc-web library doesn't support gRPC's usual message
compression - the decompression would need to occur in Javascript, where it
would be too slow to be useful. If you have your proxy server (usually
Envoy) set up correctly, this should work automatically because browsers
always set the "Accept-Encoding" request header. If you look at the
response headers in your browser's network inspector, you should see
"Content-Encoding" set to gzip or br.
In your first attempt, you're correctly setting the grpc-accept-encoding
header. I don't know the Java gRPC APIs, but it sounds like you're
compressing the response correctly. Unfortunately, when the browser
receives the response, it doesn't know how to decompress it and you're
getting an error. The response can't decompress with standard gzip tools
because it isn't valid gzip: following the gRPC protocol, each gzipped
protobuf message is wrapped in five bytes of enveloping metadata. Because
of the enveloping and the blob of gRPC-Web trailers at the end of the body,
the response as a whole isn't valid gzip.
Your second attempt has the same problem. The correct response header is
"Content-Encoding" (rather than "Content-Encryption"), but you end up with
the same problem - gRPC's per-message compression doesn't produce the sort
of compressed response that browsers expect.
Hope that helps,
Akshay
On Wednesday, July 20, 2022 at 10:51:34 AM UTC-4 Danil Vilnikov wrote:
> Hi Team!
>
> I am using gRPC-java on server side and gRPC-web on client. And I want to
> compress my response messages.
> In first case I send Metadata {'grpc-accept-encoding': 'gzip'} from client
> and call setCompressed("gzip") method on server side. But when I send
> compressed response my client fall with error 'Error in parsing response
> body'. And my response payload don't decompress with another gzip
> decompressors.
> In second case I try to push header "Content-Encryption" with value "gzip"
> into response and set method setCompressor("gzip") on server-side. But I
> get "(failed)
> net::ERR_CONTENT_DECODING_FAILED" on response status.
>
> How can I send compressed responses and proceed them on client?
>
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